Photovoltaic

9 posts / 0 new
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Paul Gilman
PV Modules and Inverters not in Database

If you are using SAM's detailed photovoltaic model for a photovoltaic system that uses a module or inverter that is not included in SAM's libraries, you can use the CEC Performance Model with User Entered Specifications or Inverter Datasheet options on the Module and Inverter input pages, respectively. Those options allow you to enter data from a manufacturer's data sheet. Behind the scenes, SAM generates the coefficients it needs to model the equipment.

2 posts / 0 new
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lovallo2
Shading/Solmetric Import Annual production reduced by too much?

Hello,

I am modeling a 70 kW array in chicago. Without shading the estimate is about 91,000 kWh.

In Solmetric my annual solar availability is 89%. This is on the roof of a highrise and only a small penthouse can cause shading.

Once I import the hourly solmetric file into SAM the production estimate drops to 62,000 kWh - a decrease of 32%!

I have carefully reviewed which skyline files are going into the shading analysis, wondering if anyone has any experience or advice?

2 posts / 0 new
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rzutshi
Error when plotting user specified model

Hello,
I'm trying to model(screenshot attached) a specific module in SAM (SVL-195 in the PDF attached) and once I enter the parameters and try to plot it throws an error "Failed to solve for module coefficients. Please check your inputs". I read a post from earlier this year (on CdTe modules) where you mentioned that this happens in thin film modules because of the "modified nonideality factor". Is that the case in this situation as well? Any workarounds? Thanks!

3 posts / 0 new
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rzutshi
Cleaning Schedule and Soiling Loss

Hello,
I am trying to model soiling losses as accurately as possible in SAM. From the documentation, it seems that SAM splits up the entered monthly soiling loss and assigns it to every hour of the month. This seems to be a reasonable approximation for a monthly cleaning schedule.

1 post / 0 new
caseyzak24
unable to access singlediodeparams or singlediode compute modules

I am using the python SDK to try and run the singlediode and singlediodeparams modules. Below is my code (note that as far as I know it is all properly indented, but I couldn't get the formatting right in this post):

irr_value_goal = list(range(25,1025,25))
singlediodecurve25 = {'irr':irr_value_goal,'Imp':[],'Vmp':[],'I_sc':[],'V_oc':[],'Pmp':[],'All_V':[],'All_I':[]}
ssc = PySSC()
# ssc.module_exec_set_print(0)
#create the data container where everthing gets carried around
data1 = ssc.data_create()

1 post / 0 new
caseyzak24
unable to access singlediodeparams or singlediode compute modules

I am using the python SDK to try and run the singlediode and singlediodeparams modules. Below is my code (note that as far a I can tell it is all properly indented but I couldn't figure out how to display it correctly in this post):

irr_value_goal = list(range(25,1025,25))
singlediodecurve25 = {'irr':irr_value_goal,'Imp':[],'Vmp':[],'I_sc':[],'V_oc':[],'Pmp':[],'All_V':[],'All_I':[]}
ssc = PySSC()
# ssc.module_exec_set_print(0)
#create the data container where everthing gets carried around

2 posts / 0 new
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rzutshi
Tiered Rate Schedule

I've got SAM mostly figured out but I have a slightly different rate schedule - it's independent of day, month and time but is a tiered charge based on monthly consumption as shown below:

Monthly Consumption Rate
0-30 kWh 0.05$/kWh
30-100 kWh 0.07$/kWh
101-200 kWh 0.1$/kWh
>200 kWh 0.12$/kWh

(This is for a country in Asia so the rates are fairly low).

Can I and how would I implement this rate schedule for monthly consumption?

Thanks!

5 posts / 0 new
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Ahmadabu
Simulation error

Hi,
I tried importing a data file into SAM for simulation and I keep getting this error message. "missing temperature nan W/m2 at time [y:1999 m:1 d:1 h:0], exiting Simulation pvsamv1 failed." I used the software's solar resource file checker and it said there are no issues with the solar resource file, please what could be the problem?

6 posts / 0 new
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yunling.li
Isolated or independent PV-systems

Hello!
I'm doing a project about PV-residential/commercial taking Piura,Peru region as a reference and I'm analyzing how the project will change if enable battery; but I don't know how to set up that the battery only load from the system.
Also, I know the program simulate different projects that are conexion to the grid and when there are excess generation,these energy is injected to the grid. However, in Peru can not perform the same.

1 post / 0 new
ShalabhK30
Need consultant for building PV system

Hello,

We are looking for consultants who can help us create a commercial offering using the SAM code base for a utility scale modelling software for PV system. Any help in this regard would be much appreciated.

Thanks & Regards,
Shalabh
Email: shalabh.khanzode@globacomllc.com

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